Automatic pump for inflating tires.



No. 664,883. Patented Jan. I, I90l. W. J. MURRAY.

AUTOMATIC PUMP FUR lNFLATlNG TIRES.

(Application filed Apr. 18, 1900.)

(No Model.)

Unrrnn STATES PATENT OFFICE.

WILLIAM J. MURRAY, OF LEAVENWORTH, KANSAS.-

AUTOMATIC PUMP FOR lNFLATlNG TIRES.

SPECIFICATION forming part of Letters Patent No. 664,883, dated January 1, 1901.

Application filed April 18, 1900. Serial No. 13,298. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM J. MURRAY, residing at Leavenworth, county of Leavenworth, and State of Kansas, have invented certain new and useful Improvements in Automatic Pumps for Inflating Tires; and I do hereby declare the following to be a full, clear, and exactdescription, such as will enable persons skilled in the art to which it appertains to make and use the same, and of which the following is a specification.

One object of my invention is to provide an air-pump for inflating the tire of a vehiclewheel, the operation of the pump being effected by the revolution of the said wheel on its axis.

A further object consists in providing a means whereby the action of the pump may be controlled by means of a suitable device while the vehicle is in motion.

A still further object is to provide a pump and its operative mechanism that will effectively perform the work desired and which will not add any friction to the progress of the vehicle except when the pump is in active operation.

Another purpose of my invention is to provide an adjustable pressure-valve that will cause an alarm to be sounded when the tire has been pumped up to the desired pressure.

In the drawings, Figure 1 is a side View of my device, partly in section, shown attached to the front wheel of a bicycle. Fig. 2 is an enlarged similar view, partly in section, showing the method of attaching the pump to the hub of the wheel and also showing the ad just-able-valve alarm-whistle and the checkvalve in section with the eccentric removed. Fig. 3 is a front view showing the eccentric and eccentric-strap in section. Fig. 4 is an enlarged side view of the eccentric and engaging device. Fig. 5 is an enlarged detail sectional view of the adjustable valve and alarm-whistle.

In all of the views the same letters of ref erence indicate similar parts. A is an ordinary air-pump cylinder terminating in a V-shaped extension at, which is designed to partly encompass the hub of the wheel B and to be held in position by means of the screws 5 and h, which pass through a similarly-shaped piece 0 and clamp the hub B between them. A counterweight c for balancing the pump is attached to or may be a part of the piece 0.

Between the extension a and the pumpcylinder A there is a cross-piece a, which is counterbored and threaded in each end, into one end of which the adjustable valve and alarm-whistle a is screwed. A check-valve a to which a tube a is attached, is screwed into the other end. The tube or is to be attaohed to the valve that communicates with the interior of the pneumatic tire, which is common to all tires of this character.

The piston of the pump A is attached to the piston-rod, which terminates in an enlarged end a and is guided in the top cap a", which is enlarged and prolonged for this purpose.

An eccentric D turns freely on the collar d. The latter is driven onto the hub B or may be otherwise fixed thereto. The eccentric also moves freely within the eccentric strap or ring (1 of the reciprocating rod 01 For the purpose of reducing the friction to a minimum between the eccentric and the collar and between the eccentric and the strap, ball-bearings may be provided, as shown at d and al A laterally-extended positive stop d is fixed to the eccentric D. A corresponding but shifting stop 6 is fixed to the sliding bar E. The latter is guided within the bearings e and e of the support (a which is held in position between the two nuts 17 and b on the shaft 1) of the hub B.

A closed spiral spring 6 is fixed to the support 6 and the bar E, which holds the bar in its normal position, so that the stop 6 is normally not within the path of the stop d? when the eccentric, strap, and collar bodily revolve around the axis of the wheel.

A cord or wire e is attached to the bar E and extends to a point within easy access of the operator or rider.

The eccentric-rod d has an oscillating bearing upon the screw-stud 61 which is firmly fixed into the end a of the piston-rod.

Referring to Fig. 5, a is a tube threaded internally and externally at one end and terminating in a whistle at the other end. An adjustable valve-seat a" is threaded, so as to be screwed into the tube a A rod a terminates in a valve a, which fits into the adjustable seat a". A collar a is fixed to the rod a and forms one abutment for the open spiral spring a which surrounds the rod a and holds the valve a in its seat. A hole 61, is an opening for the exit of the air into the whistle a The operation of my device is as follows: When the bar E is not held in the position shown in Fig. 4 by the Wire e then the stop 61 will not come in contact with the stop c in the revolution of the eccentric, and in this event the eccentric, theeccentric-strap, and the collar will all idly revolve with the wheel and there will be no more friction interposed to the revolution of the wheel than there would be if my device were entirely removed therefrom. Supposing that the operator or rider discovers that his tire is deflated, all that is necessary for him to do is to pull on the wire 6 until the bar E is lifted into the position shown in Fig. 4 against the tension of the spring 6 when the stop e will be placed in the path of the stop (1 and by this means the eccentric D will be arrested in its revolution and become stationary with reference to the revolution of the wheel, when the collard will revolve on the ball-bearings d and the cocentric-strap (1 upon the ball-bearings (1 will be reciprocated in a vertical direction, when the piston within the cylinderA of the pump will be forcibly reciprocated and the air there' by compressed, which will be forced out through the check-valve a through the tube a into the tire of the wheel. When the pressure Within the tire has reached a predetermined point, the valve 04* will be forced olf of its seat a against the spring a and the air will escape through the hole (0 and blow the whistle 61, which will notify the rider that the pressure within the tire has been sufficiently increased. He will then release the wire 6 when the bar Ewill be drawn down by the spring 6 so that the stops 6 will be removed from the path of the stop C1 and then the eccentric will again revolve idly, as before described, and the pump will become idle.

The predetermined pressure may be fixed by adjusting the position of the valve-seat a within the tube a so as to increase or decrease the tension of the spring a that holds the valve 0, on its seat.

Having described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. A device for inflating tires for vehicle- Y Wheels comprising a pump secured to the hub between the spokes of said wheel, a clamp adapted to embrace the said hub, and to hold the barrel of said pump in a position radial thereto, an eccentric loose on said hub for operating the piston of said pump, a stop on said eccentric, a movable stop on the frame of said vehicle, said stop adapted to engage with the stop on said eccentric, and a spring for returning said movable stop to its normal position, substantially as set forth.

2. A device for inflating tires of vehicle wheels comprising a pump secured to the hub of said wheel, a clamp adapted to embrace said hub, a counterweight on one member of said clamp, an eccentric for operating said pump, and a stop on the frame of the said vehicle for arresting the motion of the said eccentric, substantially as set forth.

In testimony whereof I have signed this specification, in the presence of two subscribing witnesses, this 10th day of April, 1900.

WILLIAM J. MURRAY.

Witnesses:

B. F. ENDRES, HARRY L. WILSON. 

